Prepare a Boolean map (containing 0 and 1 only), the 1 indicating the cells where the species is present (Maps/Convert). Alternatively, you can also attribute an integer weight to the species observations. In this case, replace the 1 by this weight. But you must be sure that your data are the product of a homogeneous collecting effort.
If you have got Idrisi, you can import a point vector of the sightings, and then rasterize it. ESRI Shape files are easy to convert into Idrisi.
If you do not have Idrisi, the easiest way is to somehow get a table (a tab-separated text file, or ASCII), where each row represents a sighting and columns represent X-coordinate, Y-coordinate, Weight. (if no weight, then fill this columns with "1"). You can then make a Biomapper map with the module Convertor.
Table of Contents
SPECIES MAP
Operations
Prepare a Boolean map (containing 0 and 1 only), the 1 indicating the cells where the species is present (Maps/Convert). Alternatively, you can also attribute an integer weight to the species observations. In this case, replace the 1 by this weight. But you must be sure that your data are the product of a homogeneous collecting effort.If you have got Idrisi, you can import a point vector of the sightings, and then rasterize it. ESRI Shape files are easy to convert into Idrisi.
If you do not have Idrisi, the easiest way is to somehow get a table (a tab-separated text file, or ASCII), where each row represents a sighting and columns represent X-coordinate, Y-coordinate, Weight. (if no weight, then fill this columns with "1"). You can then make a Biomapper map with the module Convertor.
Links
References